U.S. health officials on Tuesday approved the nation’s first gene therapy for an inherited disease, a treatment that improves the sight of patients with a rare form of blindness. It marks another major advance for the emerging field of genetic medicine.

The approval for Spark Therapeutics offers a life-changing intervention for a small group of patients with a vision-destroying genetic mutation and hope for many more people with other inherited diseases. The drugmaker said it will not disclose the price until next month, delaying debate about the affordability of a treatment that analysts predict will be priced around $1 million.

The injection, called Luxturna, is the first gene therapy approved by the Food and Drug Administration in which a corrective gene is given directly to patients. The

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